1、BRITISH STANDARD BS 2485:1987 Specification for Tee slots, tee bolts, teenuts and tenons UDC 621.9 229.311:621.882BS2485:1987 This British Standard, having been prepared under the directionof the Machine Engineers and Hand Tools Standards Committee, was published under the authority ofthe Board of B
2、SI and comesintoeffect on 31December1987 BSI 02-2000 First published June 1954 First revision January 1969 Second revision April 1973 Third revision December 1987 The following BSI references relate to the work on this standard: Committee reference MTE/1 Draft for comment 86/70342 DC ISBN 0 580 1635
3、9 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Machine, Engineers and Hand Tools Standards Committee (MTE/-) to Technical Committee MTE/1 upon which the following bodies were represented: Advanced Manufacturing Technology Research I
4、nstitute Cranfield Institute of Technology Department of Trade and Industry Mechanical Engineering and Manufacturing Technology Division (Mmt) Health and Safety Executive Institution of Production Engineers Ministry of Defence University of Aston in Birmingham Amendments issued since publication Amd
5、. No. Date of issue CommentsBS2485:1987 BSI 02-2000 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Designation of tee slots 1 3 Dimensions of tee slots, tee bolts, tee nuts and tenons 1 4 Dimensions of tee slots used as tenon slots 1 5 Positioning of tee slots in r
6、ectangular tables 1 6 Tee bolts and tee nuts 1 7 Tenons 1 8 Marking 1 Figure 1 Tee slot profile 2 Figure 2 Tee nut 3 Figure 3 Tee bolt 3 Figure 4 Tenon 3 Table 1 Dimensions of tee slot profile 2 Table 2 Tolerances on pitches of tee slots 3 Table 3 Dimensions of tee bolts and tee nuts 4 Table 4 Dimen
7、sions of tenons 5 Publications referred to Inside back coverBS2485:1987 ii BSI 02-2000 Foreword This British Standard has been prepared under the direction of the Machine, Engineers and Hand Tools Standards Committee and implements agreements of the International Organization for Standardization (IS
8、O). This edition supersedes BS2485:1973, which is withdrawn. It has been prepared to take account of the revision of ISO299 “Tee slots for machine tools” and the dimensions of the tee slots given are technically equivalent to those in ISO299. This standard varies from ISO299 in the following respect
9、s. Inch dimensions. In accordance with the UK policy of metrication, the inch dimensions given in ISO have not been included in this British Standard. Tee slot pitches. ISO299 states that if values of pitch greater or less than those given inTable 1 are essential, they should be chosen from the valu
10、es of the R10 series of preferred numbers and that if intermediate values are required they should be chosen from the values of the R20 series. In the interests of rationalization, this standard does not permit these choices. However, in order to facilitate interchangeability of equipment throughout
11、 a given manufacturers complete range, this standard provides for the choice of any pitch given in the standard (see clause5) rather than restricting given pitches to given sizes of tee slots as in ISO299. Tee bolts. Full dimensions and material requirements are given whereas ISO299 gives only the d
12、imensions of the bolt head. InTable 3, dimension E has been retained from the1973 edition of this standard as it is more appropriate. This standard gives dimensions for tee nuts and tenons. A British Standard does not purport to include all the necessary provisions of a contract. Users of British St
13、andards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to6, an inside back cover and a back cover. This st
14、andard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS2485:1987 BSI 02-2000 1 1 Scope This British Standard specifies dimensions for tee slots for use in machine tools and their auxiliary equip
15、ment, and dimensions for tee bolts, tee nuts and tenons to be used in the tee slots. It also specifies a range of pitches between tee slots in machine beds and materials for tee bolts, tee nuts and tenons. NOTEThe titles of the publications referred to in this standard are listed on the inside back
16、cover. 2 Designation of tee slots The tee slot and the corresponding bolt shall be designated by the nominal size of the bolt thread, e.g. M10. 3 Dimensions of tee slots, tee bolts, tee nuts and tenons The dimensions of tee slots, tee bolts, tee nuts and tenons shall be as given inTable 1 (see alsoT
17、able 2),Table 3 andTable 4 respectively. 4 Dimensions of tee slots used as tenon slots The dimensions of tee slots used as tenon slots shall be as given inTable 1 and the tolerances on the width of the throats of the slots given in column4 shall apply rather than those given in column3. 5 Positionin
18、g of tee slots in rectangular tables 5.1 One slot shall be designated as a reference slot. NOTEThe centre line of the reference slot should lie along the centre line of the machine table. If there is an even number of slots, the reference slot shall be clearly marked on the machine table itself. 5.2
19、 The pitches of the slots, i.e. the dimensions between centres, shall be as given inTable 1 and the tolerance on pitches given inTable 2 shall apply. In addition to the corresponding pitches for a tee slot given inTable 1, pitches that are multiples of the corresponding pitches may be used provided
20、that these multiples are among the pitches listed inTable 1. For example, for an M10 tee slot, pitches of50mm,100mm (50 2), 200mm (50 4) etc. are allowed, but a pitch of150mm (50 3) is not allowed since it does not appear in column14 ofTable 1. 6 Tee bolts and tee nuts Tee bolts shall be cold forged
21、 and shall have square heads. NOTEA suitable material is steel 945M38 as specified in BS970-1 or one having at least equivalent mechanical properties. Tee nuts shall be manufactured from steel 945M38 as specified in BS970-1 or one having at least equivalent mechanical properties. The dimensions of t
22、ee bolts and tee nuts shall be as given inTable 3. The load bearing faces of the heads of tee bolts and tee nuts shall be nominally square with the axis of the shank, and the head shall be nominally central with the shank. The tolerances on the squareness of the heads that are used commercially by t
23、he manufacturers of the steel bars shall apply. 7 Tenons Tenons shall be manufactured from steel045M10 as specified in BS970-1 or one having at least equivalent mechanical properties. The dimensions of tenons shall be as given in Table 4. The faces of the locating surfaces of tenons shall be square
24、and/or parallel with the vertical axis of the tenon and shall be central with the shank where applicable. NOTEIf desired unstepped tenons may be used; in which case the feature provided by dimension W is omitted, but P is unchanged. 8 Marking The following information shall be permanently and legibl
25、y marked on tee nuts and tenons: a) the number and date of this British Standard, i.e. BS2485:1987 1) ; b) the designation (see clause2). NOTESimilar marking of tee bolts is subject to agreement between the manufacturer and the purchaser. 1) Marking BS2485:1987 on or in relation to a product represe
26、nts a manufacturers declaration of conformity, i.e. a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is therefore solely the responsibility of the person making the claim. Such a declaration is not to be confused with thir
27、d party certification of conformity, which may also be desirable.BS2485:1987 2 BSI 02-2000 Table 1 Dimensions of tee slot profile (in mm) (seeFigure 1) Figure 1 Tee slot profile 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Designation of tee slot Width of throat, A 1 Width of recess, B 1(seenote1) Depth of rece
28、ss, C 1(seenote1) Overall depth of tee slot, H Chamfer 45 or radius Pitch, P (see note2 and for tolerances Table 2) Nominal Ordinary tolerance H12 a For use as tenon tolerance H8 a K F G min. max. min. max. min. max. max. max. max. M4 5 +0.12 +0.018 10 11 3.5 4.5 8 10 20 25 32 M5 6 0 0 11 12.5 5 6 1
29、1 13 25 32 40 M6 8 +0.15 +0.022 14.5 16 7 8 15 18 1 0.6 1 32 40 50 M8 10 0 0 16 18 17 21 40 50 63 M10 12 +0.18 0 +0.027 0 19 21 8 9 20 25 (40) 50 63 80 M12 14 23 25 9 11 23 28 (50) 63 80 100 M16 18 30 32 12 14 30 36 1.6 (63) 80 100 125 M20 22 +0.21 +0.033 37 40 16 18 38 45 1.6 (80) 100 125 160 M24 2
30、8 0 0 46 50 20 22 48 56 1 2.5 100 125 160 200 M30 36 +0.25 0 +0.039 0 56 60 25 28 61 71 125 160 200 250 M36 42 68 72 32 35 74 85 2.5 1.6 4 160 200 250 320 M42 48 80 85 36 40 84 95 2 6 200 250 320 400 M48 54 +0.30 0 +0.046 0 90 95 40 44 94 106 250 320 400 500 NOTE 1The limits of size of the recess B
31、1and C 1have been selected to obtain reasonable service from tee slot cutters. The maximum dimensions given in columns 6 and 8 are the dimensions that new cutters should be designed to give; cutters should not be ground so as to give dimensions less than the minimum dimensions given in columns5 and7
32、. NOTE 2The pitches shown in parentheses should be avoided owing to the smaller thickness of material between the tee slots (P min B 1 max ). a See BS4500-1.BS2485:1987 BSI 02-2000 3 Table 2 Tolerances on pitches of tee slots Pitch, P Tolerance mm mm 20 and 25 0.2 32 to 100 0.3 125 to 250 0.5 320 to
33、 500 0.8 NOTEThe tolerance on the pitch of any tee slot is non-cumulative. Figure 2 Tee nut Figure 3 Tee bolt Figure 4 TenonBS 2485:1987 4 BSI 02-2000 Table 3 Dimensions of tee bolts and tee nuts (in mm) (seeFigure 2 andFigure 3) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Designation of tee bolt and diameter
34、of thread, K Width of head (square), B 2 Depth of head C 2tol. 0.25 Length of shoulder, N a Diameter of bolt, A 2 Chamfer, E a Radius, R a Width of tee nut shank, G a Height of tee nut, H a Chamfer, F Recommended length of bolt stem, L a Length of threaded portion of bolt stem, M a nom. tol. max. no
35、m. tol. max. max. M4 9 2.5 4 5 6 30 40 50 60 70 80 100 M5 10 4 5 6 0.3 8 30 40 50 60 70 80 100 For L u 100 M =0.5L M6 13 6 6 1 8 0.5 10 60 70 80 100 M8 15 6 8 10 12 60 70 80 100 M10 18 7 10 12 16 60 70 80 100 125 160 180 For L 100 M = 0.3 L M12 22 8 12 14 0.3 0.6 19 0.3 70 80 100 125 160 180 M16 28
36、0 0.5 10 16 1 18 25 70 80 100 125 160 180 200 250 300 M20 34 14 20 22 30 45 70 80 100 125 160 180 200 250 300 M24 43 18 20 26 b 1.5 28 40 M30 53 23 20 33 b 36 45 M36 64 28 25 39 b 42 0.4 55 100 125 160 180 200 250 300 M42 75 32 25 46 b 2.5 48 0.7 65 M48 85 36 30 52 b 54 0.4 75 0.8 a Not quoted in IS
37、O299. b Tolerance 0.25. ISO299 specifies A 2as equal to K but in this standard A 2has been increased to give better symmetry of bearing surfaces.BS 2485:1987 BSI 02-2000 5 Table 4 Dimensions of tenons (in mm) (seeFigure 4) 1 2 3 4 5 6 7 8 9 10 11 12 13 Designation of tee slot Width of tenon shank, B
38、 2 Overall width of tenon, W Depth of head of tenon, Q Overall height of tenon, P Length of tenon, L Radius, R max. Fixing hole To suit socket head cap screw to BS4168-1 Clearance hole dia., A to BS4186 medium fit Counter-bore dia., B Tolerance H13 a Counter-bore depth, D Tolerance Nominal Tolerance
39、 h7 a Nominal Tolerance h7 a M4 5 0 0.012 M2 2.4 4.3 2.5 M5 6 0 0.015 16 0 0.018 5 10 25 0.6 M6 8 M3 3.4 6.0 3.5 M8 10 0 0.018 0 0.021 M10 12 30 5.5 12 30 M12 14 M6 6.6 11.0 6.5 M16 18 M20 22 0 0.021 1 M24 28 50 0 0.025 15 30 40 M30 36 0 0.025 M36 42 70 M42 48 0 0.030 25 40 60 1.5 M8 9.0 14.0 8.5 M4
40、8 54 0 0.030 a See BS4500-1. +0.2 06 blankBS2485:1987 BSI 02-2000 Publications referred to BS 970, Specification for wrought steels for mechanical and allied engineering purposes. BS 970-1, General inspection and testing procedures and specific requirements for carbon, carbon manganese, alloy and st
41、ainless steels. BS 4168, Hexagon socket screws and wrench keys: metric series. BS 4168-1, Specification for hexagon socket head cap screws. BS 4186, Specification for clearance holes for metric bolts and screws. BS 4500, ISO limits and fits. BS 4500-1, General tolerances and deviations. BS 2485:1987
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